Share capital, Stock Options Activity (Details)	3 Months Ended			9 Months Ended	12 Months Ended
	Oct. 31, 2025 $ / shares $ / shares shares	Oct. 31, 2025 USD ($) $ / shares shares	Oct. 31, 2024 USD ($) $ / shares shares	Jul. 31, 2025 $ / shares shares	Jul. 31, 2025 $ / shares shares	Nov. 06, 2024 shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		108,644	62,772	62,772	62,772
Forfeited (in shares)				(1,395)
Granted (in shares)		0	0	50,000
Cancelled (in shares)				(2,733)
Outstanding (in shares)		108,644	62,772	108,644	108,644
Exercisable (in shares)	51,859	51,859		51,859	51,859
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares		$ 22.79	$ 40.2	$ 40.2	$ 40.2
Forfeited (in dollars per share) | $ / shares				37.74
Granted (in dollars per share) | $ / shares				2.32
Cancelled (in dollars per share) | $ / shares				37.74
Outstanding (in dollars per share) | $ / shares		22.5	$ 40.2	22.79	22.79
Exercisable (in dollars per share) | $ / shares	$ 39.63	$ 39.63		$ 40.16	$ 40.16
Weighted average remaining contractual life		4 years 7 months 28 days			4 years 10 months 24 days
Stock options outstanding (in shares)	108,644	108,644	62,772	108,644	108,644	58,644
Share-based payments | $		$ 33,409
Exercise Price Range One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		2,676
Exercisable (in shares)	2,676	2,676
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares	$ 52.4
Expiry date		Jan. 17, 2028
Stock options outstanding (in shares)	2,676	2,676
Exercise Price Range Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		9,176
Exercisable (in shares)	9,176	9,176
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares	$ 52.4
Expiry date		Feb. 06, 2028
Stock options outstanding (in shares)	9,176	9,176
Exercise Price Range Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		8,411
Exercisable (in shares)	7,035	7,035
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares	$ 72.6
Expiry date		May 15, 2028
Stock options outstanding (in shares)	8,411	8,411
Exercise Price Range Four [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		764
Exercisable (in shares)	764	764
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares	$ 77.2
Expiry date		Jun. 26, 2028
Stock options outstanding (in shares)	764	764
Exercise Price Range Five [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		50,000
Exercisable (in shares)	0	0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares		$ 2.32
Expiry date		Mar. 26, 2030
Stock options outstanding (in shares)	50,000	50,000
Exercise Price Range Six [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		22,938
Exercisable (in shares)	19,500	19,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares	$ 52.4
Expiry date		Jan. 17, 2032
Stock options outstanding (in shares)	22,938	22,938
Exercise Price Range Seven [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		4,588
Exercisable (in shares)	3,900	3,900
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares	$ 52.4
Expiry date		Mar. 01, 2032
Stock options outstanding (in shares)	4,588	4,588
Exercise Price Range Eight [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		917
Exercisable (in shares)	780	780
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares	$ 52.4
Expiry date		Mar. 14, 2032
Stock options outstanding (in shares)	917	917
Exercise Price Range Nine [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		7,646
Exercisable (in shares)	6,500	6,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares	$ 52.4
Expiry date		Oct. 12, 2032
Stock options outstanding (in shares)	7,646	7,646
Exercise Price Range Ten [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Outstanding (in shares)		1,528
Exercisable (in shares)	1,528	1,528
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding (in dollars per share) | $ / shares	$ 52.4
Expiry date		Feb. 06, 2033
Stock options outstanding (in shares)	1,528	1,528
Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Share-based payments | $		$ 18,437	$ 80,893